On Friday, November 14, 2014 9:30:00 PM UTC, John Clark wrote: > > On 13 November 2014 18:57, LizR <[email protected] <javascript:>> wrote: > > >> > There appears to be a discrepancy between entropy as it is ascribed to >>> black holes and entropy in the form of configurations of mass-energy far >>> from thermodynamic equilibrium. Black hole entropy appears to be a >>> fundamental feature of physics, while the other sort only emerges due to >>> coarse graining. I'd be interested to know if anyone can shed any light on >>> this apparent discrepancy. >>> >> > I'm not sure what you mean that there are 2 types of Entropy, it always > works the same way. The Entropy of a Black Hole (and the Entropy of > anything else) is Boltzmann's constant time the logarithm of the number of > ways the Black Hole could have gotten into the state it's in now. The > reason we use a logarithm in the definition is we want to be able to say > that the total Entropy of the combined system X and Y is the Entropy of X > PLUS the Entropy of Y, if we didn't use logarithms it would be X times Y. > For example, if system X could have gotten to the way it is now in 3 > different ways and system Y could have gotten to the way it is now in 5 > different ways then the combined system could have gotten to the way it is > now in 3*5 =15 different ways, but ln 3 + ln 5 = ln 15. > > Any constant could be used but it is convenient to use Boltzmann's > constant because it's nice if Entropy is in units of energy/temperature. >
this where you strong strong strong. But the other day you say big bang was consequence of entropy by 1851 as a direct consequence. You obviously have never been in a situation of new discovery to be saying that. People need masses of convergence and independence and linking and all kinds of shit to progress a long chain of consequences. Anyway, why would it have been rigourous in 1851 to say entropy was a universal when it might have been tied to the steam turbine? or when the sun seemed to burn forever and the cosmos seemed static and eternal. I still quite fancy yer mind -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
